Results 41 to 50 of about 560,798 (337)

Multi-Color Luminescence Transition of Upconversion Nanocrystals via Crystal Phase Control with SiO2 for High Temperature Thermal Labels [PDF]

, 2020
Upconversion nanocrystals (UCNs)-embedded microarchitectures with luminescence color transition capability and enhanced luminescence intensity under extreme conditions are suitable for developing a robust labeling system in a high-temperature thermal ...
Baek, Dahye, Jeon, Inkyu, Joo, Se Hun, Kang, Seok Ju, Kwak, Sang Kyu, Lee, Jiseok, Lee, Tae Kyung, Park, Jaehyun, Shin, Subeen   +8 more
core   +1 more source

Diffraction-limited imaging with ground-based optical telescopes [PDF]

, 1988
The construction of diffraction-limited images with ground-based optical telescopes by means of closure-phase observations is explored. The effect of redundant baselines on closure-phase observations is analyzed, and it is shown that for bright objects a
Nakajima, T. S., Neugebauer, G., Oke, J. B., Pearson, T. J., Readhead, A. C. S., Sargent, W. L. W.   +5 more
core   +1 more source

Quasi non-diffractive electron Bessel beams using direct phase masks with applications in electron microscopy

New Journal of Physics, 2019
Electron-beam shaping opens up novel imaging possibilities in electron microscopy (EM). The implementation of a phase or amplitude mask in the condenser lens system allows the generation of electron beams with various shapes. Non-diffractive Bessel beams
Simon Hettler, Lukas Grünewald, Marek Malac   +2 more
doaj   +1 more source

Laboratory validation of the dual-zone phase mask coronagraph in broadband light at the high-contrast imaging THD-testbed

, 2016
Specific high contrast imaging instruments are mandatory to characterize circumstellar disks and exoplanets around nearby stars. Coronagraphs are commonly used in these facilities to reject the diffracted light of an observed star and enable the direct ...
Baudoz, P., Caillat, A., Delorme, J. R., Dohlen, K., Dupuis, O., Galicher, R., N'Diaye, M., Rousset, G., Soummer, R.   +8 more
core   +3 more sources

Fabrication of two-layer integrated phase mask for single-beam and single-exposure fabrication of three-dimensional photonic crystal [PDF]

, 2008
In this paper, we report a new design and fabrication of an integrated two-layer phase mask for five-beam holographic fabrication of three-dimensional photonic crystal templates.
Ahmad Harb, Belikov, Bruck, Daniel Rodriguez, Di Xu, Fienup, Gerchberg, K. P. Chen, Karen Lozano, Lacolle, Lacolle, Leskova, Sagberg, Sinclair, Sinclair, Suleski, Swanson, Turunen, Vorontsov, Wyrowski, Yuankun Lin, Zhou, Zhou, Zhou   +23 more
core   +1 more source

Experimental phase-error extraction and modelling in silicon photonic arrayed waveguide gratings [PDF]

, 2020
We present a detailed study of parameter sweeps of silicon photonic arrayed waveguide gratings (AWG), looking into the effects of phase errors in the delay lines, which are induced by fabrication variation.
Bogaerts, Wim, Fiers, Martin, Khan, Umar, Xing, Yufei   +3 more
core   +1 more source

Annular Groove Phase Mask Coronagraph [PDF]

The Astrophysical Journal, 2005
We present a new phase mask coronagraph consisting in an optical vortex induced by a space-variant surface relief subwavelength grating. Phase mask coronagraphy is a recent technique aiming at accommodating both high dynamic and high angular resolution imaging of faint sources around bright objects such as exoplanets orbiting their parent stars or host
Mawet, D., Riaud, P., Absil, O., Surdej, J.   +3 more
openaire   +3 more sources

Design and Application of Phase-Only Diffractive Optical Element Based on Non-Iterative Method

Photonics, 2022
In this study, we devised a method for the design of continuous phase-only holographic masks that map laser light to arbitrary target illumination patterns, which have a wide range of applications.
Kuo Shi, Gongjian Zhang
doaj   +1 more source

Multi-stage four-quadrant phase mask: achromatic coronagraph for space-based and ground-based telescopes

, 2011
Less than 3% of the known exoplanets were directly imaged for two main reasons. They are angularly very close to their parent star, which is several magnitudes brighter.
Abe, Baudoz, Baudoz, Bloemhof, Boccaletti, Boccaletti, Carlotti, Galicher, J. Baudrand, Mawet, Mawet, Mawet, P. Baudoz, R. Galicher, Riaud, Riaud, Rouan, Soummer   +17 more
core   +2 more sources

Robust source and mask optimization compensating for mask topography effects in computational lithography [PDF]

, 2014
Mask topography effects need to be taken into consideration for a more accurate solution of source mask optimization (SMO) in advanced optical lithography.
Lam, EYM, Li, J
core   +1 more source